Rotary engine.



No. 674,422. u Patented May 2l, I90l'. B. LJUNGSTRDM.

RGTRY ENGINE.

(Application filed Oct. '10, 1900.)

FFICE.

PATENT BIRGER LJUNGS'IRM, OF STOCKHOLM, SWEDEN.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 674,422, dated May 21, 1901.

Application led October 10,1900. Serial No. 32,626. (No model.)

To @ZZ whom t may con/cern:

Be it known that 1, BIRGER LJUNGSTRM, engineer, of 1S Gref-lvlagnigatan, Stockholm, Sweden, haveinvened Improvements in Rotary Engines, of which the following is a specification.

This invention relates to rotary engines of the class in which tothe casing ofthe engine is connected an annular curved track for rolls supported by pistons which by means of the driving duid are moved in cylinders placed radially on a central shaft of the engine.

The object o'f the invention is to prevent as far as possible the violent vibrations and the noise caused by said vibrations in such engines. In such engines where the curved track is firmly attached to a surrounding casing the vibrations of the engine are transmitted to said casing, which thus also is caused to vibrate, and thereby produces a noise, which is especially inconvenient in large engines. In order to prevent this in-v convenience as much as possible, I do not directly fix the curved track to the casing, but I make the connection by means of links, intei-posed pieces, projections, or such means, which prevent the rotation of the track and the transmitting of the radial vibrations to the casing. These links, pieces, or projections might be elastic or stiff; but in the latter case they must be placed in such a manner that they cannot transmit the radial vibrations from the track to the casing.

In the accompanying drawings a rotary engine arranged according to my invention is illustrated in partial section in Figure 1, the other figures illustrating modiiications of the invent-ion.

1 is the casing; 2, the curved track; 3, the cylinders; 4, their pistons, and 5 the rollers running on the track.

As illustrated in Fig. 1, the connection between the track and the casing is obtained bysuspending the track on springing pins 6, resting in the casing with their ends. Accoi-ding to Fig. 2 these pins are replaced by springs 7, arranged between the track and the surrounding casing and joined to both. In Fig. 3 instead ofthe springs an elastic packing 8 is used, which is placed betweenthe curved track and the casing, and in Fig. 4 it is illustrated how the track is kept into its place in the casing by means of a corrugated metal slip or spring 9, which is placed between and joined to both of these parts.

In Fig. 5 the curved track is connected to the casi ng by means of bolts l0, which at their inner ends are joined to the track, preferably by means ol' other bolts 11, and pass freely through grooves or bores arranged in the track and in the casing. Said grooves, however, are not radial, but pass obliquely, and

the bolts 10 at their outer ends are connected to the casing by means of a nut, between which and the casing may be arranged a spring 12.

In Fig. t5 the track is united to the casing by turnable non-radial links 13, which allow of the radial vibrations of the track, but which on account of their position do not transmit these vibrations to the casing.

In Fig. 7 the track is provided with lugs 14, which are loosely embraced by corresponding lugs 15 on the inside of the casing, upon which the lugs 14 do not bear, but are free to vibrate radially. These lugs 14 may, of course, also be arranged on the casing, in which case they are guided between corresponding lugs on the track.

Having now particularly described and ascertained the nature of my said invention and in whatmanner the same is to be performed, I declare that what I claim is- Y 1. In a rotary engine, the combination of a casing, a plurality of radially-arranged cylinders within said casing, pistons within the cylinders, rollers carried by the pistons, a track Within the casing upon which the rollers run, and means for holding the track in a manner to allowr the same radial vibrations without transmitting them to the casing While holding the track against circumferential displacement, substantially as described.

2. In a rotary engine having a number of radial cylinders surrounded by a casing and containing pistons, which are acted upon by the driving I'luid and carry rollers running on asurrounding curved track, the combination with said track of bolts passing obliquely through the casing and at their inner ends being joined to the track, their outer ends being supported by the casing, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses. x

mnena LJUNGSTRM.. 

